Characterization of the mouse allograft model of APL. (A) The survival of mice (n = 9) was monitored between days 0 and 27. Two mice died on day 24, 2 on day 26, and 3 on day 27. (B) Leukemic cells were identified in whole blood smears. A normal neutrophil is marked with a white arrowhead, and leukemic cells are marked with yellow arrowheads (scale bar, 50 μm).